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Physiology of Transition from Intrauterine to Extrauterine Life

2012; Elsevier BV; Volume: 39; Issue: 4 Linguagem: Inglês

10.1016/j.clp.2012.09.009

1557-9840

Noah H. Hillman, Suhas G. Kallapur, Alan H. Jobe,

Neuroscience of respiration and sleep

The transition from fetus to newborn is the most complex adaptation that occurs in human experience. Lung adaptation requires coordinated clearance of fetal lung fluid, surfactant secretion, and onset of consistent breathing. The cardiovascular response requires striking changes in blood flow, pressures, and pulmonary vasodilation. Energy metabolism and thermoregulation must be quickly controlled. The primary mediators that prepare the fetus for birth and support the multiorgan transition are cortisol and catecholamine. Abnormalities in adaptation are frequently found following preterm birth or cesarean delivery at term, and many of these infants need delivery room resuscitation to assist in this transition.